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2 Sheets- Sheet 1.

(No Model.)

L. BERNHARD.

BOILBR SETTING Patented Apr. 19, 1898.

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(No Model.)

L. BERNHARD.

Damn-m I rrrrrrrrzrrrrrzzzrrrz lNVENTOR ATT() NEY WITNESSES:

NTTED STATES PATENT Trice.

LOUIS BERNHARD, OF BRIDGEPORT, CONNECTICUT, ASSIGNOR TO I CHARLES LEE, OF .SAME PLACE.

BOILERSETTING.

SPECIFICATION' forming part of Letters Patent No. 602,717, dated April 19, 1898.

Application fled December 4, 1897. Serial No. 6601772. (No model.)

To all whom it may concern:

Beit known that I, Louis BERNHARD, a citizen of the United States, residing at Bridgeport, in the county of Fairfield and State of Connecticut, have invented certain new and useful Improvements in Boiler-Settings; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to certain new and useful improvements in boiler-settings, but more particularly has reference to the construction and arrangement of the stay-bolts which extend through the setting from the rear to the front and serve to keep the front plate of the boiler in position.

The object of my invention is to prevent the cracking of the iron plate at the front of the setting; and with these ends in view my invention consists in the details of construction and combination of parts,such as will be hereinafter fully set forth and then specifically designated by the claim.

In the accompanying drawings, which form a part of this application, Figure 1 is a horizontal sectional view showing a boiler-setting equipped With my improvement, and Fig. 2 is a front view of such a boiler.

Similar numerals of reference denote like parts in both figures of the drawings.

Heretofore it has been the usual custom to pass the bolts through the setting from the front to rear and to secure the bolts in position by means of nuts driven on the ends of the bolts. At the rear. of the boiler these nuts are usually driven against the vertical stayrods which lie at against the outside of the brickwork, While at the front of the boiler the nuts are driven firmly against the iron plate which forms the front facing of the setting and contains the doors for the flues and the lire-box. The boiler proper usually abuts at its frontend against this iron front plate, and since this plate is held firmly against the brick setting by means of the stay-bolts it frequently happens that the expansion of the boiler against the plate or the expansion of the plate itself will cause the latter to become cracked, and it is the aim of my present in- Vention to prevent this.

I form the stay-bolts from steel rods coiled throughout the greaterportion of their lengths into the form of coil-springs, the extreme ends of the bolts being extended out straight and threaded to receive the nuts.

In the drawings I have designated the coiled portion of the stay-bolts by the numeral 1, while 2 denotes the threaded portions at the ends which are threaded.

3 are the vertical stays at the rear Wall of the furnace, and 4 are nuts driven upon the rear ends of the stay-bolts firmly against these stays. v

5 is the iron front plate of the boiler-setting, which is secured to the brickwork 6 by means of nuts 7, driven upon the threaded front ends of the stay-bolts. These stay-bolts are contained within tubes 8, which are secured Within the brickwork of the setting,- the object of these tubes being to afford a smooth surface against which the coils of the stay-bolts may operate during the distention or contraction of such coils. The provision of these tubes also prevents any pieces of brick or mortar or other foreign substances from clogging the coils or in any way interfering with their free movements. As many of these stay-bolts may be employed as may be deemed desirable, and they may be located in any suitable part of the brick setting.

When the boiler or the front plate expands, the stay-bolts will lengthen out, owing tothe distention of their coiled portions, and When the boiler and plate contract these coiled portions of the stay-bolts Will by their resiliency contract and thereby draw the plate firmly in position. It will thus be seen that this front plate cannot be held firmly and-rigidly at any point or points while it is bowed out or expanded at other portions, and therefore there can be no possible danger of cracking.

Spring washers or threaded sections of coiled springs interposed between the boilerplate and the nut would not bring about the result aimed at and accomplished by my invention, since in order to properly set the nuts such devices would be rigidly compressed, so that they would entirely lose their spring nature. Inmy improvm ent the spring element is extensive, since it occupies nearly the entire length of the stay-bolts, and the nuts may be firmly set, While at the same time the bolts will extend when the boiler or the plate expands.

Vhile I prefer the construction shown in the drawings, it will of course be clear that the straight portions 2 of the bolts may be made separate from the coiled portions and united thereto in any suitable and ordinary manner, and therefore I do not Wish to be limited to making these straight portions and coiled portions integral.

Having thus described myinvention, what I claim as new, and desire to secure by Letters Patent, is-

In a boiler-setting, the combination of the tubes which extend Within the brickworlr of the setting, the stay-bolts having resilient coils throughout the greater portion of their lengths, said coils extending Within said tubes While the extremities of the stay-bolts are straight and threaded, the vertical stays at the rear of the furnace throughwhich said bolts pass, the nuts driven on the rear ends of said bolts against said stays, the iron faceplate at the front of the setting through which said bolts pass, and the nuts driven on said bolts against said plate, substantially as set forth.

In testimony whereof I affix my signature in presence of two Witnesses.

LOUIS BERNHARD.

Witnesses J. S. FINCH, M. T. LONGDEN. 

